/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.inlong.sort.iceberg.sink.trick;

import org.apache.iceberg.StructLike;

/** Copy the StructLike's values into a new one. It does not handle list or map values now. */
class StructCopy implements StructLike {

    static StructLike copy(StructLike struct) {
        return struct != null ? new StructCopy(struct) : null;
    }

    private final Object[] values;

    private StructCopy(StructLike toCopy) {
        this.values = new Object[toCopy.size()];

        for (int i = 0; i < values.length; i += 1) {
            Object value = toCopy.get(i, Object.class);

            if (value instanceof StructLike) {
                values[i] = copy((StructLike) value);
            } else {
                values[i] = value;
            }
        }
    }

    @Override
    public int size() {
        return values.length;
    }

    @Override
    public <T> T get(int pos, Class<T> javaClass) {
        return javaClass.cast(values[pos]);
    }

    @Override
    public <T> void set(int pos, T value) {
        throw new UnsupportedOperationException("Struct copy cannot be modified");
    }
}
